Sponge
175g 75% Dark Chocolate Buttons
150g Unsalted Butter
125ml Hot Water
3 Medium Eggs
125ml Sour Cream, at room temperature
50ml Vegetable Oil
150g Caster Sugar
150g Light Soft Brown Sugar
250g Self-raising Flour
50g Cocoa Powder
1½ Tsp Bicarbonate of Soda
¼ tsp Salt
Milk Chocolate Ganache
300g 55% Islands Chocolate
25g Unsalted Butter, diced
450ml Double Cream
Mirror Glaze
470g Sugar
195g Water
350g Single Cream
195g Glucose
135g Cocoa Powder
25g Gelatine